Perhaps you should try some spelling variations:
ban hanh » ban hang
hieu van » hieu va, thien van, lieu va
hanh ta » hanh tai, hanh tam, hanh va
cam cua » ca cua, nam cua, cau cua
van cam » van nam, van lam, van cau
tu sach » thu sach, su sach, te sach
ho nang » thi nang, kha nang, cao nang
lo nang » ly nang, loai nang, cao nang
co hoi » co hoc, co loi
ta luu » tam luu

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: tu sach ((lo nang) or (ho nang)) co hoi. hieu van cam cua ban hanh ta luu (tru OR truc)~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ((lo nang) OR (ho nang)) co hoi. hieu van cam cua ban hanh ta luu (tru OR truc).
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ((lo nang) or (ho nang)) co hoi. hieu van cam cua ban hanh ta luu (tru OR truc)".
• Adding a wildcard symbol may retrieve word variants: tu sach ((lo nang) or (ho nang)) co hoi. hieu van cam cua ban hanh ta luu (tru OR truc)*.